In elementary chemistry textbooks you often have pictures like the following one:
Are there any conventions how to get them?
I am not sure, but I guess that it are contour plots with only one iso-surface of constant probability density $|\psi|^2$ such that the (integrated) probability for an electron to be inside of on the blue volumes, is 90 %.
If so, give those conditions a unique result and how to solve it numerically? Maybe you could add an example using python mayavi or something like that.
Note that my question is not of how to visualize the probability density via colormap or scatter plots, that's conceptually clear.